If in fact the reason why you are not getting a period is because you have "exercise induced amenorrhea", that is the result of a dysfunction of the hypothalamus. It is detrimental to your health because, you are not forming the hormones that your body needs. The purpose of the birth control pill was not mainly to have a period, it is not needed in a person who is not making a uterine lining, but the birth control pill gives you the essential hormone estrogen. In addition, the hypothalamus is important for production of other hormones as well including thyroid hormone.
In terms of your fertility, your ovaries will be shut down so that you will have difficulty getting pregnant unless you decrease your exercising so that you have normal ovarian function (have natural periods) or you use fertility medications to replace the hormones the hypothalamus is not producing, to stimulate the ovaries to ovulate.
So, I know that you are an exercise junkie, but keep in mind that instead of making you more healthy, it may actually be more detrimental to your health in many ways, including achieving pregnancy.